Process of making oxyfuel torch tips



E. H. SMITH PROCESS OF MAKING OXYFUEL T0563 TIPS Filed March 18. 1936 July 5, 1927.

- NITED STATES 'ELHER E. SMITH, OF MINNEAPOLIS, MINNESOTA.

PROCESE' 01" MAKING OZYFUEL TORCH TIPS.

Application filed latch 18, 1826. Serial No. 95,805.

This invention relates to the oxy-fuel torch ti invention shown and described in my pen 'ng application for Letters Patent of the United States #82944, filed January 18, 1926, and the object of my present invention is to provide a means whereby the gases flowing through the passages or ducts in the tip Wlll be mixed thoroughly before reaching the exit orifice of the tip, the structure of the tip and the method of forming the longitudinal gas passages or ducts therein being substantiall the same as described in my application a ove referred to.

The invention consists generally in various constructions and combinations all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is a view of a core having a tapered end ready to receive the longitudinal groove or ducts therein,

Figure 2 is a view partlally in section showing the completed ducts with annular grooves formed in the surface of the core and intersecting the longitudinal ducts or gas passages; V

Figure 3 is a sectional view on the line 3-3 of Figure 2;

Figure 4 is a sectional view on the line H of Figure 2;

Figure 5 is a longitudinal sectional view showing the tip completed and ready for use with the central bore therein and the longitudinal ducts and the encircling jacket or shell formed by immersing the core in an electro-plating bath;

Figure 6 is a view corresponding to Figure 2 showing a modified means for connecting the longitudinal ooves or passages to insure the mixing. 0 the gases before delivery to the end of the tip;

Figure 7 is a transverse sectional view on the line 7 7 of Figure 5.

In the drawing, 2 represents a core of suitable material having a tapered end 3 and provided with a longitudinally arranged central bore 4. The core may be of a suitable gauge of tubing with the bore centrally formed therein and provided with comparatively thick heavy walls in which a series of gas ducts are usually formed by drilling as fully described in my application above referred to. This drillin operation has been found to be both la orious and expensive and as fully described in my pendmg application, Imlll or otherwise form aseries of longitudinal grooves or ducts 5 suit ably spaced apart in the surface of the core 2 and running from end to end thereof. In this particular tip as illustrated in Figure 3, I have shown six of these grooves or ducts, but do not confine myself to this number as any other suitable number may be provided dependin upon the size of the tip and the purpose or which it is to be used.

Within these grooves, I place strips of fusible material 6 and then I immerse the core in an electro-plating bath and let it remain therein until a sufficient quantity of metal has collected over the outer surface of the tip and over the ducts and the strips of fusible metal therein to form a shell or jacket of suitable thickness. The end of this shell or jacket will then be machined in a suitable manner to form the discharge orifice of the tip and the jacket is exteriorly threaded as at 7 and provided with a collar 8, by means of which the tip may be inserted into the head of the torch or as shown and described in detail in my application above'referred to. The fusible strips 6 when subjected to heat, can be readily 'scharged from the grooves, leaving them clear and unobstructed for the flow of gas through the tip. The shell or jacket is provided at intervals with ports 9 leading to the longitudinal ducts, and to effect a thorough mixture of the gases it is desirable to have these lon itudinal ducts communicate with each 01; er intermediate to the ends of the tip. I, therefore, provide annular grooves or recesses 10 in the surface of the core adapted to communicate with each of the longitudinal ducts and allow the gases therein to flow around the core and the gas in one longitudinal duct to mix and mingle with the gases of all the other correspondmg ducts be ore reaching the end of the tip. These annular grooves 10 after being formed in the peripheral surface of the core are filled with a suitable fusible material 6 corresponding to that described with reference to the longitudinal ducts. This fusible material will be melted and discharged from the grooves at the same time that the ducts are cleared of the fillers therein by the application of heat thereto.

When these longitudinal ducts and the annular grooves have all been cleared of the fusible material therein, the ducts will be unobstructed to the flow of as therethrough and the annular grooves wi insure the d1stribution of the gases around the peripheral surface of the core and the proper and uniform minglin of the gases in each duct with the gases of all the other ducts. Then when the unfinished outer surface of the shell or jacket has been suitably machined, the tip is ready for mountin in the head of the torch and all the la or incidental to the drilling of the tip has been eliminated as well as the expense caused b the time required for such drilling and t e almost continual breakage of drills and discarding of the partly or nearly finished tips.

In Figure 6, a modified construction is shown which consists in providing a spiral groove 10 in the surface of the core extendmg at an incline in the surface instead of in a direct line transversel of the axis of the core, this spiral groove having all the functions of the grooves 10 and insuring the thorough mixture of the gases flowing longitudinally through the ducts. The tapered end of the core serves to converge the ends of the ducts and deliver the gases at a single point. I have shown this core equipped with a central bore but it will be understood that it may be formed into a tip as shown in Figures 9 to 15 of my application above referred to in which the peripheral surface of the core has longitudinal grooves or ducts therein,-but the central bore is omitted entirely, and except for the annular or spiral recess or grooves extending circumferentially of the core the device shown herein corresponds in construction and method of manufacture to that of my application above indicated. When the jacket of the desired thickness has been formed around the core, the fusible material, wax or whatever substance may be placed in the ducts and grooves will be fused and discharged and then w en the tip has been suitably ma-.

chined, it is ready for mounting in the torch head and for use.

I claim as my invention: V

1. A process of making a one-piece oxyfuel gas tip which consists in providing a core, formlng a series of longitudinal and transverse grooves in the peripheral surface of the core, filling these grooves with a material fusible at low tem erature, immersing the core in an electro-p ating bath until a shell or jacket of the desired thickness has been formednver and around the longitudinal and transverse grooves, then fusing the materialin said grooves, thereby forming a series of longitudinal and transverse gas ducts in the tip.

2. A process of making a one-piece oxyfuel as tip which consists in providing a fiavin atapered .end forming a series of longitu inal grooves in the peri heral surface of the core, converging towar each material in the grooves to other in said tapered end and also forming a transverse peripheral groove intersecting said longitudinal roove, immersing the core in an electro-platlng bath until a shell or jacket of the desired thickness has been formed over and around said grooves to thereby provide a series of longitudinal ducts through the tip, and a peripheral mixing groove intersecting said ducts.

3. A process of making an oxy-fuel gas tip which consists in providing a core, grooving or milling the peripheral surface of the core to form a serles of longitudinal recesses, forming a eripheral groove intersecting said longitu inal recesses to form a communicating passage between them, filling these grooves and recesses with a substance fusible at a comparatively low temperature, immersing the core in an electroplating bath until a shell or jacket of the desired thickness has been formed thereover and then fusing the material in said recesses and grooves to provide a series of longitudinal ducts therein, and an intersecting transverse recess or duct communicating with said longitudinal ducts.

4. A process of making an oxy-fuel gas tip, which consists in providing a core, grooving or milling the'peripheral surface thereof to provide a series of surface recesses therein, filling these recesses with a substance fusible at a comparatively low temperature, immersing the core in an electro-plating bath until a shell or jacket of the desired thickness has been formed thereover and then fusing the material in said recesses to provide a series of longitudinal ducts there- 1n.

5. A process of makin an oxy-fuel gas tip which consists in provi ing a core having a tapered end, grooving or milling the peripheral surface of the core to form a series of longitudinal recesses converging at one end of the core, filling these recesses with a substance fusible at a comparatively low temperature, immersing the core in an electro-plating bath until a shell or jacket of the desired thickness has been formed over the core and grooves, and then fusing the material in the grooves to provide a series of longitudinal ducts therein.

6. A process of making an oxy-fuel gas tip which consists in providing a core and forming a longitudinal bore centrally therein, grooving or-milling the peripheral surface of the core to provide a series of surface recesses therein, filling these recesses with a substance fusible at a comparatively low temperature, immersing the core in an electro-plating bath until the shell or 'acket of the desired thickness has been-forme over the core and grooves and then fusing the provide a series of longitudinal ductstherein.

7. A process of making an oxy-fuel gas tip which consists in taking an elongated block of metal forming a. core, boring it centrally. andlongitudinally, tapering one end of the core and formingatintervals in its 5 peripheral surface a series of longitudinal ducts or recesses, filling these recesses with a material fusible at a. comparatively low temperature, placing the core in an electroplating bath to form a 'acket or shell encircling the core over sai recesses and then fusing the material in said recesses.

In witness whereof, I have hereunto set my hand this 15th day of Marh 1926.

,ELMER H. sMITH. 

